Purpose Various studies suggested that family ownership plays a significant role in R&D investment considering family-owned businesses. This thesis specifically explores sibling ownership and how it influences R&D Investment in their company. Moreover, various factors have been highlighted and explored extensively to understand what makes the difference between sibling owners and sole owners when it comes to their behaviors whether to pursue and invest in R&D for the betterment of the company. Method This paper adopted qualitative research as a method. Data was collected from 5 cases which consisted of sibling owners and sole owners to understand the differences between 2 types. In this multiple case study, two respondent took part in each case. Semi-structured interviews were carried out to have an in-depth understanding of the cases. Furthermore, the analysis of these data was done using the SEWi scale which provided us the three dimensions to scrutinize the impact on R&D investment by sibling owners and compare it with sole owners. Conclusion Using the theoretical lenses, the sibling ownership presents a unique attitude as of any other family ownership. To have a more broader approach, the comparison between a sole owner and sibling owner derived many different factors to take up R&D Investments. It shows that sibling owner does not always initiate investment for the company to prosper but they consider other family members involvement for investing. R&D investments are taking part in the sibling ownership by keeping the family wealth in mind. This tends to provide evidence that sibling owner is careful in investment for R&D. Family values and family unity in sibling owned business create an immense impact on the decision making for the investment. Considering the decision making regarding R&D investment, sibling owner believe that they have ease to make a decision when the family is involved whereas sole owner finds difficulty in taking such decisions, especially under uncertainty. The following observations from our research provided the idea that sibling owner initiative to invest in R&D is not only restricted to the company growth perspective but also the involvement of various family dimensions.